18546481 has 4 divisors (see below), whose sum is σ = 18627700. Its totient is φ = 18465264.

The previous prime is 18546469. The next prime is 18546499. The reversal of 18546481 is 18464581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17514225 + 1032256 = 4185^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 18546481 - 2¹⁵ = 18513713 is a prime.

It is a super-2 number, since 2×18546481² = 687943914966722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18546481.

It is not an unprimeable number, because it can be changed into a prime (18546461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40266 + ... + 40723.

It is an arithmetic number, because the mean of its divisors is an integer number (4656925).

Almost surely, 2^18546481 is an apocalyptic number.

It is an amenable number.

18546481 is a deficient number, since it is larger than the sum of its proper divisors (81219).

18546481 is an equidigital number, since it uses as much as digits as its factorization.

18546481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81218.

The product of its digits is 30720, while the sum is 37.

The square root of 18546481 is about 4306.5625503410. The cubic root of 18546481 is about 264.6999380442.

The spelling of 18546481 in words is "eighteen million, five hundred forty-six thousand, four hundred eighty-one".